I had dropped the ball on the sync issue, but now have yet another problem. I can't turn the unit off. The light changes from red to blue, but it is still on. I emailed customer support with all the problems, and they said it had to be returned for the power issue. No word on the sync or subwoofer hum. The limited call in hours make it difficult to talk with them directly since I should be at home with my unit, but I work during all the available hours. Your unit wouldn't turn on, mine won't turn off. I'm not impressed with the quality control for this unit. I can't do anything about it this week, but I will try to call in next week. I will post whatever I hear.